Superheater.



Patented June 25, mil.

w. scumn'r. SUPERHEATER.

(Application filed Oct. 4, 1899.)

(No Model.)

WifnessS:

ATENT rricni IVILHELM SCHMIDT, OF WILHELMSHQIIE, GERMANY.

SUP ERl-IEATER.

SPECIFICATION forming part of Letters Patent No. 676,919, dated June 25, 1901'.

Application filed October 4, 1899 T0 aZZ whom it may concern:

Be it known that I, WILHELM SCHMIDT, a subject of the King of Prussia, German En1- peror, and a resident of W'ilhelmshohe, near Oassel, in the Province of Hesse-Nassau, German Empire, have invented certain new and useful Improvements in Superheating Arrangements with Separate Firings, of which the following is an exact specification.

Hitherto many industrial experiments have been made to improve superheating arrangements having special firings and to protect these superheaters against glowing and burning. In most of these experiments the super heater either formed a part of the boiler and was fired by the same or it was arranged separately, having a special separate firing, the burning and the glowing of the pipes being prevented by intercalation of Ohamotte walls.

Proportionally large quantities of heat are necessary to render a superheater effective, and in practice the first manner of building superheaters only has shown favorable results with certain installations; but with ordinary boilersas, for instance, marine boilers, for which only small space V is available-they have not proved successful. The second manner-viz., intercalation of Chamotte side wallsis impracticable with superheaters having special firings for the reason that they do not prevent the glowing and rapid destruction of the superheatingpipes owing to the radiated heat influencing the superheating- 1 es. p %or marine boilers the employment of Ghamotte side walls is impracticable owing to their heavy weight and fragility. The question of employing highly-superheated steam in marine boilers becoming more and more important, it is essential to build superheating arrangements in which the glowing and burning of the superheating-pipes during the inactivity of the machine is prevented and by means of which, nevertheless, a thorough superheating of large quantities of steam is effected. To attain this end, I propose to adopt a way hitherto not employed in practicevia, I do not combine, as hitherto, a boiler having its own firing with a separate superheating arrangement; but I consider the superheater as a chief element and connect it in a suitable manner with an auxiliary Serial No. 732,513. (No model.)

boiler having the only reason to destroy the dangerous influences resulting from the separate firing of the superheater.

In my improved superheating arrangement I employ a firing being wholly independent of the firing of the principal boiler. I conduct the steam of the principal boiler into the superheater protected by the pipes of an auxiliary boiler of suitable construction. Thereby I attain that the proportionally hot fire-gases before passing around the super heating-pipes pass around the water-pipes of the auxiliary boiler, thereby the glowing and burning of the superheater-pipes being prevented and nevertheless a large quantity of heat being employed for superheating the steam within the superheating arrangement.

The essential point of my invention is the independence of the superheating arrangement and of the principal boiler and the possibility to employ the steam of the auxiliary boiler in conjunction with the steam of the principal boiler.

In order to make my invention more clear, I refer to the accompanying drawings, in which I beg to give an example Where the auxiliary boiler isbuilt into the superheater proper. Thereby all possible losses of heat are prevented and the fire-gases are allowed to pass over the whole surface of the superheating-pipes, a good protection for the same being created by the water-pipes of the auxiliary boiler.

Figure 1 represents a vertical section through my arrangement; and Fig. 2 illustrates an elevational view, partly being in section.

In the drawings, a represents the firing. On both sides, somewhat higher than the firing itself, the water-drums b of the auxiliary boiler are arranged. 8 illustrates the steam-drum of the same, which might be raised or lowered at convenience. connected by pipes e, curved at the lower part. 7' illustrates the superheating-pipes, the feet of which are covered with gravel and separated from the pipes c by means of Chamotte walls cl. \Vhen now the-fire-gases tend to pass around the water-tube 0, they proach to the end of the curve of the tubes 0, owing to the Ohamotte walls d. Arrived at Both are are obliged to contract the more they ap-- the end of the curves they have a free passage and pass along the whole length of the superheating-pipes 7'. The admission of the steam coming from the principal boiler is effected by the tube 0 conducting the steam to a steam-dru m 'i. From here the steam through the pipe 7" flows down to the receptacle 70, from there, as clearly to be seen from the drawings, again upward into the steam-drum h, where a pipe Z conducts the highly-superheated steam to the engine.

In my invention it is an essential point that I have two different streams of heat, the one arising from the fire and the other coming from the chief boiler and passing from the top drum i to the lower drum 7s and rising again onto the drum h, whereby the heat of the fire-gases is utilized during the whole passage.

Having thus fully described the natn re of myinveution, what I desire to secure by Letters Patent of the United States is In superheaters, the combination with a main and an auxiliary boiler, a firing a, a water-drum b and a steam-drum s, which can be varied in its position,water-pipes c curved at their bottom extremities and connecting the water-drum b to the steam-drum s, an accumulating-drum 11 fed from the main boiler, an accumulating-drum h, both drums 2' h being arranged vertically above the steamdrum 8, a drum is located above the Waterdrum 1), superheating-pipes r partly leading 

